<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title>五子棋游戏</title>
		<meta name="Description" content="git上看到的一个很值得学习练习的简易h5+js制作的小游戏，很久没有摸键盘码代码了，刚好拿来练练手。" />
		<style type="text/css">
			canvas {
				display: block;
				margin: 50px auto;
				-webkit-box-shadow: -2px -2px 2px #efefef, 5px 5px 5px #b9b9b9;
				box-shadow: -2px -2px 2px #efefef, 5px 5px 5px #b9b9b9;
				cursor: pointer;
			}
			
			.btn_wrap {
				display: -webkit-flex;
				display: -ms-flexbox;
				display: flex;
				-webkit-flex-direction: row;
				-ms-flex-direction: row;
				-webkit-justify-content: center;
				justify-content: center;
			} 
			
			.btn_wrap div {
				margin: 0 10px;
			}
			
			div>span {
				display: inline-block;
				padding: 10px 20px;
				color: #FFF;
				background: #ee82ee;
				-webkit-border-radius: 5px;
				-moz-border-radius: 5px;
				border-radius: 5px;
				cursor: pointer;
			}
			
			div.unable span {
				background: #d6d6d4;
				color: #adacaa;
			}
			
			#result-wrap {
				text-align: center;
			}
		</style>
	</head>

	<body>
		<h3 id="result-wrap">--五子棋游戏--</h3>
		<canvas id="chess" width="450px" height="450px"></canvas>
		<div class="btn_wrap">
			<div id="restart" class="restart">
				<span>重新开始</span>
			</div>
			<div id="goback" class="goback unable">
				<span>悔棋</span>
			</div>
			<div id="return" class="return unable">
				<span>撤销悔棋</span>
			</div>
		</div>
		<a href="https://github.com/wj704/wj704.github.io/blob/master/five_game.html">原文地址</a>
	</body>
	<script type="text/javascript">
		var over = false;
		var me = true; //我
		var _nowi = 0,
			_nowj = 0;
		var _compi = 0,
			_compj = 0;
		var _myWin = [],
			_compWin = [];
		var backAble = false,
			returnAble = false;
		var resultTxt = document.getElementById('result-wrap');
		var chressBord = [];
		for(var i = 0; i < 15; i++) {
			chressBord[i] = [];
			for(var j = 0; j < 15; j++) {
				chressBord[i][j] = 0;
			}
		}

		//赢法的统计数组
		var myWin = [];
		var computerWin = [];

		//赢法数组
		var wins = [];
		for(var i = 0; i < 15; i++) {
			wins[i] = [];
			for(var j = 0; j < 15; j++) {
				wins[i][j] = [];
			}
		}

		var count = 0; //赢法总数
		//横线赢法
		for(var i = 0; i < 15; i++) {
			for(var j = 0; j < 11; j++) {
				for(var k = 0; k < 5; k++) {
					wins[i][j + k][count] = true;
				}
				count++;
			}
		}

		//竖线赢法
		for(var i = 0; i < 15; i++) {
			for(var j = 0; j < 11; j++) {
				for(var k = 0; k < 5; k++) {
					wins[j + k][i][count] = true;
				}
				count++;
			}
		}

		//正斜线赢法
		for(var i = 0; i < 11; i++) {
			for(var j = 0; j < 11; j++) {
				for(var k = 0; k < 5; k++) {
					wins[i + k][j + k][count] = true;
				}
				count++;
			}
		}

		//反斜线赢法
		for(var i = 0; i < 11; i++) {
			for(var j = 14; j > 3; j--) {
				for(var k = 0; k < 5; k++) {
					wins[i + k][j - k][count] = true;
				}
				count++;
			}
		}

		//debugger
		for(var i = 0; i < count; i++) {
			myWin[i] = 0;
			_myWin[i] = 0;
			computerWin[i] = 0;
			_compWin[i] = 0;
		}
		var chess = document.getElementById('chess');
		var context = chess.getContext('2d')
		context.storkeStyle = '#bfbfbf'; //边框颜色
		var backbtn = document.getElementById('goback');
		var returnbtn = document.getElementById('return');
		window.onload = function() {
			drawChessBoard();
		}

		document.getElementById('restart').onclick = function() {
			window.location.reload();
		}
		//我，下棋
		chess.onclick = function(e) {
			if(over) {
				return;
			}
			if(!me) {
				return;
			}
			//悔棋功能可用
			backbtn.className = backbtn.className.replace(new RegExp("(\\s|^)unable(\\s|$)"), " ");
			var x = e.offsetX;
			var y = e.offsetY;
			var i = Math.floor(x / 30);
			var j = Math.floor(y / 30);
			_nowi = i;
			_nowj = j;
			if(chressBord[i][j] == 0) {
				oneStep(i, j, me);
				chressBord[i][j] = 1; //我，已占位置
				for(var k = 0; k < count; k++) { //将可能赢的情况都加1
					if(wins[i][j][k]) {
						//debugger
						myWin[k]++;
						_compWin[k] = computerWin[k];
						computerWin[k] = 6; //这个位置对方不可能赢了
						if(myWin[k] == 5) {
							//window.alert('你赢了');
							resultTxt.innerHTML = '恭喜，你赢了！';
							over = true;
						}
					}
				}
				if(!over) {
					me = !me;
					computerAI();
				}
			}
		}

		//悔棋
		backbtn.onclick = function(e) {
			if(!backAble) {
				return;
			}
			over = false;
			me = true;
			//resultTxt.innerHTMl = "(⊙o⊙)，悔棋中";
			//撤销悔棋功能可用
			returnbtn.className = returnbtn.className.replace(new RgeExp("(\\s|^)unable(\\s|$)"), " ");
			//我，悔棋
			chressBord[_nowi][_nowj] = 0; //我，已占位置 还原
			minusStep(_nowi, _nowj); //销毁棋子
			for(var k = 0; k < count; k++) { //将可能赢得情况都减1
				if(wins[_nowi][_nowj][k]) {
					myWin[k]--;
					computerWin[k] = _compWin[k]; //这个位置对方可能赢
				}
			}

			//计算机相应的悔棋
			chressBord[_compi][_compj] = 0; //计算机，已占位置 还原
			minusStep(_compi, _compj); //销毁棋子
			for(var k = 0; k < count; k++) {
				if(wins[_compi][_compj][k]) {
					computerWin[k]--;
					myWin[k] = _myWin[i]; //这个位置对方可能赢
				}
			}
			resultTxt.innerHTML = "--益智五子棋--";
			returnAble = true;
			backAble = false;
		}

		//撤销悔棋
		returnbtn.onclick = function(e) {
			if(!returnAble) {
				return;
			}
			//我，撤销悔棋
			chressBord[_nowi][_nowj] = 1; //我，已占位置
			oneStep(_nowi, _nowj, me);
			for(var k = 0; k < count; k++) {

				if(wins[_nowi][_nowj][k]) {
					myWin[k]++;
					_compWin[k] = computerWin[k];
					computerWin[k] = 6; //这个位置对方不可能赢
				}
				if(myWin[k] == 5) {
					resultTxt.innerHTML = '恭喜，你赢了！';
					over = true;
				}
			}

			//计算机撤销相应的悔棋
			chressBord[_compi][_compj] = 2; //计算机，已占位置
			oneStep(_compi, _compj, false);
			for(var k = 0; k < count; k++) { //将可能赢得情况减一
				if(wins[_compi][_compj][k]) {
					computerWin[k]++;
					_myWin[k] = myWin[k];
					myWin[k] = 6; //这个位置对方不可能赢
				}
				if(computerWin[k] == 5) {
					resultTxt.innerHTML = "┗|｀O′|┛ 嗷~~，计算机赢了，继续加油！";
					over = true;
				}
			}
			returnbtn.className += " " + "unable";
			returnAble = false;
			backAble = true;
		}

		//计算机下棋
		var computerAI = function() {
			var myScore = [];
			var computerScore = [];
			var max = 0;
			var u = 0,
				v = 0;
			for(var i = 0; i < 15; i++) {
				myScore[i] = [];
				computerScore[i] = [];
				for(var j = 0; j < 15; j++) {
					myScore[i][j] = 0;
					computerScore[i][j] = 0;
				}
			}
			for(var i = 0; i < 15; i++) {
				for(var j = 0; j < 15; j++) {
					if(chressBord[i][j] == 0) {
						for(var k = 0; k < count; k++) {
							if(wins[i][j][k]) {

								if(myWin[k] == 1) {
									myScore[i][j] += 200;
								} else if(myWin[k] == 2) {
									myScore[i][j] += 400;
								} else if(myWin[k] == 3) {
									myScore[i][j] += 2000;
								} else if(myWin[k] == 4) {
									myScore[i][j] += 10000;
								}

								if(computerWin[k] == 1) {
									computerScore[i][j] += 220;
								} else if(computerWin[k] == 2) {
									computerScore[i][j] += 420;
								} else if(computerWin[k] == 3) {
									computerScore[i][j] += 2100;
								} else if(computerWin[k] == 4) {
									computerScore[i][j] += 20000;
								}
							}
						}
						if(myScore[i][j] > max) {
							max = myScore[i][j];
							u = i;
							v = j;
						} else if(myScore[i][j] == max) {
							if(computerScore[i][j] > computerScore[u][v]) {
								u = i;
								v = j;
							}
						}
						if(computerScore[i][j] > max) {
							max = computerScore[i][j];
							u = i;
							v = j;　
						} else if(computerScore[i][j] == max) {
							if(myScore[i][j] > myScore[u][v]) {
								u = i;
								v = j;
							}
						}

					}
				}
			}

			_compi = u;
			_compj = v;
			oneStep(u, v, false);
			chressBord[u][v] = 2; //计算机占据位置
			for(var k = 0; k < count; k++) {
				if(wins[u][v][k]) {
					computerWin[k]++;
					_myWin[k] = myWin[k];
					myWin[k] = 6; //这个位置对方不可能赢了；
					if(computerWin[k] == 5) {
						resultTxt.innerHTML = "┗|｀O′|┛ 嗷~~，计算机赢了，继续加油！";
						over = true;
					}
				}
			}
			if(!over) {
				me = !me;
			}
			backAble = true;
			returnAble = false;
			var hasClass = new RegExp('unable').test("" + returnbtn.className + "");
			if(!hasClass) {
				returnbtn.className += " " + "unable";
			}
		}

		//绘画键盘；
		var drawChessBoard = function() {
			for(var i = 0; i < 15; i++) {
				context.moveTo(15 + i * 30, 15);
				context.lineTo(15 + i * 30, 435);
				context.stroke();
				context.moveTo(15, 15 + i * 30);
				context.lineTo(435, 15 + i * 30);
				context.stroke();
			}
		}

		//画棋子
		var oneStep = function(i, j, me) {
			context.beginPath();
			context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI); //画圆
			context.closePath();
			//渐变
			var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 + j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);

			if(me) {
				gradient.addColorStop(0, '#0a0a0a');
				gradient.addColorStop(1, '#636766');
			} else {
				gradient.addColorStop(0, '#d1d1d1');
				gradient.addColorStop(1, '#f9f9f9');
			}
			context.fillStyle = gradient;
			context.fill();
		}

		//销毁棋子
		var minusStep = function(i, j) {
			//擦除该圆
			context.clearRect((i) * 30, (j) * 30, 30, 30);

			//重画该圆周围的格子
			context.beginPath();
			context.moveTo(15 + i * 30, j * 30);
			context.lineTo(15 + i * 30, j * 30 + 30);
			context.moveTo(i * 30, j * 30 + 15);
			context.lineTo((i + 1) * 30, j * 30 + 15);
			context.stroke();
		}
	</script>

</html>